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Semen extender is a liquid diluent which is added to semen to preserve its fertilizing ability. It acts as a buffer to protect sperm cells from their own toxic byproducts, as well as protecting the sperm from cold shock and osmotic shock during the chilling and shipping process (the semen is chilled to reduce metabolism).
The most common cryoprotectant used for semen is glycerol (10% in culture medium). Often sucrose or other di-, trisaccharides are added to glycerol solution. Cryoprotectant media may be supplemented with either egg yolk or soy lecithin, with the two having no statistically significant differences compared to each other regarding motility, morphology, ability to bind to hyaluronate in vitro, or ...
Lecithin contains dietary precursors to choline, an essential nutrient, which was formerly classified as a B vitamin (vitamin B 4). [17] [18] Lecithin is a mixture of fats that contains phospholipids, including phosphatidylcholine, and the human body can convert phosphatidylcholine into choline.
Sperm quality is better in the afternoon than in the morning. [43] Adrenaline-levels are higher during awakening (~06.00 to noon), [44] which may contribute similarly to general stress. Lack of exercise, as well as excessive exercise, are minor factors. In professional sports, semen quality parameters tend to decrease as training requirements ...
Spermatozoa, in this case human, are a primary component in normal semen, and the agents of fertilization of female ova. Semen, also known as seminal fluid, is a bodily fluid that contains spermatozoa. Spermatozoa are secreted by the male gonads (sexual glands) and other sexual organs of male or hermaphroditic animals and can fertilize the ...
Pages in category "Semen" The following 34 pages are in this category, out of 34 total. ... Semen cryopreservation; Semen quality; Seminal fluid protein; Sperm;
[29] [30] Combined marked suppression of testicular testosterone production resulting in testosterone levels of just above the castrate/female range (70 to 80% decrease, to 100 ng/dL on average) and marked androgen receptor antagonism with high-dosage cyproterone acetate monotherapy causes profound sexual dysfunction in men.
Common inherited variants in genes that encode enzymes employed in DNA mismatch repair are associated with increased risk of sperm DNA damage and male infertility. [39] As men age there is a consistent decline in semen quality, and this decline appears to be due to DNA damage. [40]
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